Sites discussing practical welding and similar tasks tend to give much lower numbers than science-oriented sites, probably because of rapid heat loss in typical use. A number of sites warn that measurements done with thermocouples can be wildly inaccurate. More definitive information is available in the North American Combustion Handbook.

As a general practical guideline, consider one site's list of these heats for their jewelers' (gas/oxygen) torch:

2200°C = 3992°F, for Propane/Oxygen

2927°C = 5300°F, for MAPP Gas/Oxygen

2700°C = 4892°F, for Acetylene/Oxygen

3200°C = 5792°F, for Hydrogen/Oxygen

For their fuel/air torch they list:

1225°C = 2237°F with Propane-Butane Gas

For more theoretical/ideal values, consider this table (which also includes a few temperatures other than for gas/oxidixer mixtures):